Lee Burningham on wed 15 sep 10
Howdy,
=3D20
I'm looking up an old recipe out of Herbert Sanders's book, "Glazes for =3D
Special Effects". One of the recipes references Frit #15. What is it? What =
=3D
is the chemical composition? Where do I find any? The book was printed in =
=3D
1974 and I'm having difficulty tying some of the older listed glaze =3D
materials to more modern and more readily accessible materials lists.
=3D20
Any help would be greatly appreciated.
=3D20
Lee Burningham
getting students playing with crystalline glazes in Logan, Utah
=3D20
John Hesselberth on wed 15 sep 10
Hi Lee,
It could be Fusion Frit F-15
Fusion Frit F-15
Low expansion frit
Chemistry %
K2O 3.60
Na2O 2.60
Al2O3 3.80
B2O3 23.00
SiO2 67.00
On Sep 15, 2010, at 2:22 PM, Lee Burningham wrote:
> Howdy,
>=3D20
> I'm looking up an old recipe out of Herbert Sanders's book, "Glazes =3D
for Special Effects". One of the recipes references Frit #15. What is =3D
it? What is the chemical composition? Where do I find any? The book was =3D
printed in 1974 and I'm having difficulty tying some of the older listed =
=3D
glaze materials to more modern and more readily accessible materials =3D
lists.
>=3D20
> Any help would be greatly appreciated.
>=3D20
> Lee Burningham
> getting students playing with crystalline glazes in Logan, Utah
>=3D20
Richard White on fri 17 sep 10
Lee, I believe this "Frit #15" is one of Mr. Sander's own devising, or if=
=3D
not his own, in common use by potters of his time. In his book (which is =
=3D
a
classic!), he describes working with commercial frits starting on p. 30, =
=3D
and
then gives several recipes on p. 32 using various of them. At the end of =
=3D
p.
32, he begins describing DIY frits. He lists the base components of Frit =
=3D
#15
on p. 36 as potassium carbonate - 552, zinc oxide - 648, and silica - 120=
=3D
0.
Potassium carbonate is the chemical name for pearl ash. You could perhaps=
=3D
try mixing a glaze using the appropriate proportions of the underlying ra=
=3D
w
materials (though it would not perform in the same manner as if the
materials had been fritted and ground). Or you could put this data into a=
=3D
glaze calculation program to generate a percentage analysis and then look=
=3D
for a commercial frit that comes close. Or put the full glaze recipe into=
=3D
a
glaze calculation program using the appropriate proportions of the
underlying raw materials and then try to concoct a new recipe that matche=
=3D
s
the unity analysis of the old recipe, except now using whatever current
commercial frits you might have. Which particular recipe(s) in the book
were you interested in?
dw
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